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I need help in my Statistics (math) homework, They are 5 trials,

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Thread replies: 6
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Anonymous
2016-07-07 05:47:04 Post No. 152195
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Anonymous 2016-07-07 05:47:04 Post No. 152195 [Report]
I need help in my Statistics (math) homework, They are 5 trials, each with probability of success (correct) given by P= .20 or 20%.
Question is
Find the probability that the number x of correct answer is AT LEAST 3.

The answer i got is 0.943
>>
Anonymous 2016-07-07 06:54:19 Post No.152224
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Anonymous 2016-07-07 06:54:19 Post No.152224 [Report]
>>152195
(.2)^3(.8)^2 * (5 choose 3) + (.2)^4(.8)^1 * 5 + .2^5 = 0.05792 exactly
>>
Anonymous 2016-07-07 17:13:22 Post No.152337
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Anonymous 2016-07-07 17:13:22 Post No.152337 [Report]
>>152224
thank you soo much
>>
Anonymous 2016-07-07 19:02:15 Post No.152363
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Anonymous 2016-07-07 19:02:15 Post No.152363 [Report]
Would it be the same if its MORE THAN 2?
>>
Anonymous 2016-07-07 19:59:53 Post No.152385
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Anonymous 2016-07-07 19:59:53 Post No.152385 [Report]
>>152363
yes
>>
Anonymous 2016-07-07 20:40:34 Post No.152412
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Anonymous 2016-07-07 20:40:34 Post No.152412 [Report]
>>152385
thanks
Thread replies: 6
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